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(No Model.)

A. P. EOLOOMB.

STEAM GENERATOR.

No. 318,902. Patented May 26, 1885.

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ABEL P. HOLCOMB, OF SILVER CREEK, NE\V YORK.

STEANl-GENERATQR.

forming par: of Letters Patent No. 318,902, dated May 26, 1885.

Application filed May 22, 1852.

To aZZ whom it may concern.-

Be it known that I, ABEL P. Honoonn, of Silver Creek, in the county ofChautauqua and State of New York, have invented new and usefulImprovements in Steam-Generators, of which the following is aspecification.

This invention relates to an improvement in that class ofsteam-generators which are designed for producing steam under a lowpressure for warming buildings and similar purposes. Steam-generators ofthis class are, to a certain extent, objectionable, because the hotgases or products of combustion must leave the generator at a highertemperature than the temperature of the steam which is generated, whichresults in a corresponding loss of heat.

The object of my invention is to utilize, as far as possible, the heatwhich is contained in the hot gases or products of combustion after theyhave left the generator; and my invention consists to that end of awater-heater of improved construction arranged in the exit-- passage ofthe products of combustion, as will be hereinafter fully set forth, andpointed out in the claim.

In the accompanying drawings, Figure 1 represents a sectional elevationof a steamgenerator provided with my improvement. Fig. 2 is a horizontalsection in line as m, Fig. 1.

Like letters of reference refer to like parts in both figures.

A represents a steam-generator of any suitable and well-knownconstruction, that shown in the drawings being a generator for whichLetters Patent of the United States, No. 231,320, were granted to meAugust- 17, 1880.

B represents the fire'pot of the steanrgen erator; G, the ash-pit; 1),the fuel-magazine; E, the waterspace; F, the outer casing, and G thepipe or passage through which the hot gases or products of combustionescape from the generator.

H represents a pipe through which the products of combustion areconducted to the chimney or Smokestack.

I represents an enlarged chamber connect ing the passage G with the pipeH.

K represents a coil of pipe or any other suitable water-heater having alarge heating surface, which is arranged in the chamber 1, through whichthe hot gases pass, and which (X0 model.)

receives or absorbs a large portion of the heat which is contained inthese gases.

As shown in the drawings, the waterheater K consists of a verticalannular head, L, having a. central opening, Z, and arranged at the upperend of the heater, :1. similar annular head, M, having a centralopening, an, and arranged horizontally at the lower end of the heater,and elbow-pipes N, which are secured with their upper ends to thevertical head L, and with the lower ends to the horizontal head M. Theheads L M serve to establish communication between all the pipes N attheir ends. The heads L M are made smaller in diameter than the chamber1, so as to form an annular opening between each head and thesurrounding casing for the passage of the hot gases.

- 0 represents a radiator of any suitable and wellknown construction,which has its upper end connected by a flow-pipe, p, with the upperhead, L, of the water-heater; and q represents a return-pipe, whichconnects the lower end of the radiator with the lower head, M, of thewater-heater.

R represents a water-supply pipe, which communicates with the returnpipe(1, and which serves to keep the water-heater, radiator, and connectingpipes filled with water, and which permits the expansion of the water asit becomes heated.

S represents a damper arranged at the lower end of thechamber I, nearits junction with the pipe H, for regulating the draft through saidchamber; and T represents a pipe which connects the pipe H with theashpit O, and which is provided with a damper, t, which latter can beopened when the grate is shaken, for the purpose of permitting the dustto escape into the chimney through the pipes T and H.

The hot gases or products of combustion which escape from the generatorthrough the opening G pass through and around the upper head, L, of thewater-heater, thence along the upper horizontalbranches of the pipes N,thence downward along the vertical branches of the pipes N, and finallythrough and around the head M andinto the pipe H. The water contained inthe heater K absorbs heat from the hot gases, and moves through theheater in a direction opposite to that in which the gases move throughthe chamber I, and escape finally from the heater at the hottest pointthereof through the flow-pipe p, which conducts the hot water to theradiator O. In the latter the water parts with its heat, and as itbecomes cool it returns through the pipe 9 to the lowest and coolestpoint of the heater K. In this manner a constant circulation of water ismaintained through these parts, and a large portion of the heatcontained in the hot gases is utilized for heating purposes, and aconsiderable saving of fuel is thereby efiected. The conduit throughwhich the hot gases pass to the smoke-flue is preferably lined withfire-brick, or is otherwise protected, to prevent radiation of the heat.

The steam generated in the generator A is

